#include <stdio.h>
int main()
{
    printf("%d\n", sizeof(float));
    printf("%d\n", sizeof(double));
    printf("%d\n", sizeof(long double));

    float a = 3.1415926;
    double b = 3.1415926;

    printf("%.2f\n", a);
    printf("%.3lf\n", b);
    return 0;
}